
/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkUtils.h"
#include "SkColorPriv.h"
#include "SkColorFilter.h"
#include "SkPicture.h"
#include "SkTypeface.h"

// effects
#include "SkGradientShader.h"
#include "SkUnitMappers.h"
#include "SkBlurDrawLooper.h"

static void makebm(SkBitmap* bm, SkBitmap::Config config, int w, int h)
    {
    bm->setConfig(config, w, h);
    bm->allocPixels();
    bm->eraseColor(0);

    SkCanvas    canvas(*bm);
    SkPoint     pts[] = { { 0, 0 }, { SkIntToScalar(w), SkIntToScalar(h) } };
    SkColor     colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
    SkScalar    pos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
    SkPaint     paint;

    SkUnitMapper*   um = NULL;

    um = new SkCosineMapper;
//    um = new SkDiscreteMapper(12);

    SkAutoUnref au(um);

    paint.setDither(true);
    paint.setShader(SkGradientShader::CreateLinear(pts, colors, pos,
                    SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode, um))->unref();
    canvas.drawPaint(paint);
    }

static void setup(SkPaint* paint, const SkBitmap& bm, bool filter,
                  SkShader::TileMode tmx, SkShader::TileMode tmy)
    {
    SkShader* shader = SkShader::CreateBitmapShader(bm, tmx, tmy);
    paint->setShader(shader)->unref();
    paint->setFilterBitmap(filter);
    }

static const SkBitmap::Config gConfigs[] =
    {
    SkBitmap::kARGB_8888_Config,
    SkBitmap::kRGB_565_Config,
    SkBitmap::kARGB_4444_Config
    };
static const int gWidth = 32;
static const int gHeight = 32;

class TilingView : public SampleView
    {
        SkPicture*          fTextPicture;
        SkBlurDrawLooper    fLooper;
    public:
        TilingView()
            : fLooper(SkIntToScalar(1), SkIntToScalar(2), SkIntToScalar(2),
                      0x88000000)
            {
            fTextPicture = new SkPicture();
            for (size_t i = 0; i < SK_ARRAY_COUNT(gConfigs); i++)
                {
                makebm(&fTexture[i], gConfigs[i], gWidth, gHeight);
                }
            }

        ~TilingView()
            {
            fTextPicture->unref();
            }

        SkBitmap    fTexture[SK_ARRAY_COUNT(gConfigs)];

    protected:
        // overrides from SkEventSink
        virtual bool onQuery(SkEvent* evt)
            {
            if (SampleCode::TitleQ(*evt))
                {
                SampleCode::TitleR(evt, "Tiling");
                return true;
                }
            return this->INHERITED::onQuery(evt);
            }

        virtual void onDrawContent(SkCanvas* canvas)
            {
            SkRect r = { 0, 0, SkIntToScalar(gWidth*2), SkIntToScalar(gHeight*2) };

            static const char* gConfigNames[] = { "8888", "565", "4444" };

            static const bool           gFilters[] = { false, true };
            static const char*          gFilterNames[] = {     "point",                     "bilinear" };

            static const SkShader::TileMode gModes[] = { SkShader::kClamp_TileMode, SkShader::kRepeat_TileMode, SkShader::kMirror_TileMode };
            static const char*          gModeNames[] = {    "C",                    "R",                   "M" };

            SkScalar y = SkIntToScalar(24);
            SkScalar x = SkIntToScalar(10);

            SkCanvas* textCanvas = NULL;
            if (fTextPicture->width() == 0)
                {
                textCanvas = fTextPicture->beginRecording(1000, 1000);
                }

            if (textCanvas)
                {
                for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++)
                    {
                    for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++)
                        {
                        SkPaint p;
                        SkString str;
                        p.setAntiAlias(true);
                        p.setDither(true);
                        p.setLooper(&fLooper);
                        str.printf("[%s,%s]", gModeNames[kx], gModeNames[ky]);

                        p.setTextAlign(SkPaint::kCenter_Align);
                        textCanvas->drawText(str.c_str(), str.size(), x + r.width()/2, y, p);

                        x += r.width() * 4 / 3;
                        }
                    }
                }

            y += SkIntToScalar(16);

            for (size_t i = 0; i < SK_ARRAY_COUNT(gConfigs); i++)
                {
                for (size_t j = 0; j < SK_ARRAY_COUNT(gFilters); j++)
                    {
                    x = SkIntToScalar(10);
                    for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++)
                        {
                        for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++)
                            {
                            SkPaint paint;
                            setup(&paint, fTexture[i], gFilters[j], gModes[kx], gModes[ky]);
                            paint.setDither(true);

                            canvas->save();
                            canvas->translate(x, y);
                            canvas->drawRect(r, paint);
                            canvas->restore();

                            x += r.width() * 4 / 3;
                            }
                        }
                    if (textCanvas)
                        {
                        SkPaint p;
                        SkString str;
                        p.setAntiAlias(true);
                        p.setLooper(&fLooper);
                        str.printf("%s, %s", gConfigNames[i], gFilterNames[j]);
                        textCanvas->drawText(str.c_str(), str.size(), x, y + r.height() * 2 / 3, p);
                        }

                    y += r.height() * 4 / 3;
                    }
                }

            canvas->drawPicture(*fTextPicture);
            }

    private:
        typedef SampleView INHERITED;
    };

//////////////////////////////////////////////////////////////////////////////

static SkView* MyFactory()
    {
    return new TilingView;
    }
static SkViewRegister reg(MyFactory);

